| 李建宇*,王卓涛,齐刚,李宇.镁合金疲劳后的静态拉伸声发射特性研究[J].实验力学,2022,37(2):277~287 |
| 镁合金疲劳后的静态拉伸声发射特性研究 |
| Study on static tensile acoustic emission characteristics of magnesium alloy after fatigue |
| 投稿时间：2021-03-07 修订日期：2021-05-25 |
| DOI：10.7520/1001-4888-21-048 |
| 中文关键词: 疲劳损伤 镁合金 静态拉伸 声发射 信息熵 幅值 |
| 英文关键词:fatigue damage magnesium alloy static tension acoustic emission information entropy amplitude |
| 基金项目:国家自然科学基金(11272234)资助项目 |
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| 中文摘要: |
| 基于声发射对微损伤的高敏感性特点,本文对不同疲劳损伤程度试件静态拉伸过程中的声发射信号进行分析，得出了镁合金材料的早期损伤演化规律。首先,构建了对疲劳加载后的镁合金进行静态拉伸并同时采集声发射信号的试验方案,实现利用不同损伤程度下材料拉伸声发射性能的差异性来评价材料疲劳损伤的目的；其次,对所采集声发射信号的统计分析,研究声发射特征参数随循环加载次数变化的规律,结果显示声发射幅值强度随着循环次数的增加而衰减；最后,利用信息熵分析方法对拉伸过程中声发射幅值分布谱的演化规律进行表征,并结合拉伸断口的断面形貌分析结果，得出了材料疲劳过程中各个阶段损伤模式的差异性。研究表明,静态拉伸声发射信号中蕴涵了不同疲劳损伤阶段的差异性信息,声发射幅值强度和分布演化信息熵是疲劳损伤的敏感量,将其用于镁合金早期疲劳损伤的检测和表征是可行的。 |
| 英文摘要: |
| Based on the high sensitivity of Acoustic Emission to micro-damage,an experimental approach was proposed for characterizing the early fatigue damage evolution of magnesium alloy by static tensile acoustic emission. Firstly,the experimental scheme of static tensile and acoustic emission signal acquisition of magnesium alloy after fatigue loading was constructed to evaluate the fatigue damage of materials by using the difference of tensile acoustic emission performance under different damage degrees. Secondly,through the statistical analysis of the collected acoustic emission signals,the variation of acoustic emission characteristic parameters with the number of cycles is studied. The results show that the number of acoustic emission events and amplitude parameters decrease with the increase of the number of cycles. Finally,the variation of acoustic emission amplitude characteristics with the number of cycles is analyzed,and the difference of damage modes in different fatigue damage stages is studied by SEM analysis. The results show that the static tensile acoustic emission signal contains the difference information of different fatigue damage stages,and the number of acoustic emission events and amplitude parameters are sensitive to initial fatigue damage. It is feasible to detect and characterize the early fatigue damage of magnesium alloys. |
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